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EF Investigation 3
Test Description: Electromagnets
Instructions: Answer all questions to get your test result.
1) Which of the following is true?
A
IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will increase
B
IF the wire is coiled fewer times around the nail, THEN the strength of the electromagnet will increase
C
IF the piece of iron is bigger, THEN the strength of the electromagnet will decrease.
D
IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will decrease
2) In an electromagnet, a current is passed through loops of wire that surround a core. Which material would be best to use as the core of an electromagnet?
A
A screw
B
A pencil
C
A pen
D
A piece of chalk
3) Which objects could you combine to build an electromagnet?
A
Compass, source of electric current, copper wire
B
Copper wire, source of electric current, steel screw
C
Battery, lightbulb, plastic straw
D
Battery, generator, steel screw
4) Which of these actions will increase the strength of the magnetic field produced around an electromagnet?
A
Disconnect the wire from the energy source
B
Wrap the wire around a piece of wood
C
Connect the wire to a device such as a lightbulb
D
Increase the number of coils of the wire around the iron core
5) An iron nail is not normally magnetic. In an electromagnet, the iron nail can attract iron and steel. How can a nail become magnetized in an electromagnet?
A
The electricity in running through the wire produces a magnetic field and magnetizes the iron
B
Being close to the battery magnetizes the nail
C
The nail is a special type of nail
D
The paper clips will magnetize the nail
6) What happens to the magnetic field created by an electromagnet when the wire is disconnected from the source of energy?
A
The magnetic field stays the same
B
The magnetic field reverses direction
C
The magnetic field becomes stronger
D
The magnetic field “turns off”
7) Which of the following is true about an electromagnet?
A
The current may not be turned on or off.
B
Its strength is reduced by increasing the voltage.
C
Its strength is reduced by adding more loops of wire around the nail.
D
Increasing the voltage increases its strength.
8) How can you turn an iron nail into an electromagnet?
A
Give the nail a strong static electric charge.
B
Wrap an electrical wire around it and include it in a closed circuit.
C
Rub the nail with a strong bar magnet.
D
Wrap an electrical wire around it and include it in an open circuit.
9) The north pole of an electromagnet will attract
A
both poles of a bar magnet
B
the south pole of a bar magnet
C
neither pole of a bar magnet
D
the north pole of a bar magnet
10) Students attached both ends of along wire to the poles of a battery and wound the wire around a spoon. They found that the spoon will now pick up small objects made of iron. This is because the flow of electricity is able to produce
A
light energy
B
a sound wave
C
thermal energy
D
a magnetic field
*select an answer for all questions
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